When Nu'Bia first meets Diana, she mistakenly calls Diana by the name of her former queen "Antiope". Nu'Bia is only slightly surprised to discover that Diana is Antiope's niece. The woman identifies herself to Diana as Nu'Bia and says that she was a Themyscirian Amazon who won the "Tournament of Grace and Wonder" just as Diana previously had, and become the Amazons' first champion. Her assigned mission was to guard Doom's Doorway, which is an entrance to the river Styx and the Tartarus Gate on Themyscira. Entering Doom's Doorway she was to guard the entryway from the inside, stopping anyone from entering or any creature from escaping. As Diana was never told of Nu'Bia it is assumed that the Themyscirian Amazons assumed she perished during her mission long before Diana's birth. Sometime during her time in the underworld, Nu'bia explains she met the Zoroastrian god of light, Ahura Mazda, and became his lover. She also explains that on another adventure where she aided Gorgons, she was given the ability called Cold Sight which allows her to transform any living being into stone as a gift of gratitude from the Gorgons. After aiding Wonder Woman with her mission Nu'Bia then returns to the underworld to see Ahura Mazda.
The next time Nu'Bia is shown, an elevator in a Las Vegas hotel suddenly manifests a golden metal lion insignia. When Diana investigates this strange occurrence, Nu'Bia steps out of the elevator. She says, "Many leagues from the kingdom of light have I traveled. Through the province of Nox and the territory of shades have I hunted the demon-king Ahriman. Finally, to track him here, to Patriarch's World... to my ancient faraway home. How passing strange it is then, Princess, that I should find you here, as well."
The demon Ahriman murdered Ahura Mazda, and carved his heart from his body. Nu'Bia has come back to earth in search of Ahriman, hoping that she can retrieve the heart and revive her lover. The last we see of Nu'Bia, she has Ahriman in her possession and rides an elevator back to Hades to revive her beloved.
- Amazonian Physiology: The Amazons are a race warrior women that have received gifts and blessings from five Olympian goddesses: Artemis, Athena, Demeter, Hestia and Aphrodite. Nu'bia possesses the same potential powers as an average Amazon. These include:
- Enhanced Intellect: A gift from Athena, the Amazons have the wisdom to be guided by peace and justice.
- Superhuman Strength
- Superhuman Durability
- Superhuman Stamina
- Superhuman Agility
- Immortality: The Amazons were gifted immortality. The people of Themyscira lived forever, though could be killed in war or in an accident. Those who followed Antiope and Phthia and became the Bana-Mighdall lost their immortality.
- Self-Sustenance: So long as Nu'bia stays on Themyscira, she does not require food, water or any other form of nourishment to maintain her health and vitality. Although they are not susceptible to the throes of hunger, this does not mean that Amazons don't consume food for enjoyment. The Amazons frequently hold great festivals wherupon food is served.
- Amazonian training: The Amazons honed their skills in many fields, aided by the gifts from Athena and Artemis.
- Appearances of Nu'bia (New Earth)
- Images featuring Nu'bia (New Earth)
- Quotations by or about Nu'bia (New Earth)
- Character Gallery: Nu'bia (New Earth)